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Show 1897.] ANATOMY OF A MANATEE. 51 differently by various observers. Owen states that they are lobulated, thus differing from the Dugong which has non-lobulated kidneys. Murie describes the kidneys in the following words :- " Each renal organ in our female is 5 inches long, the two lying opposite one another. Their figure is simple, with only a superficial indication of lobulation, but in reality absence of division; hilus shallow." I found the kidneys in the larger of the M. latirostrls examined by m e to be six inches in length by three in breadth; they are distinctly lobulated externally (fig. 4), and before Kidney of Manatus latirostrls. U, ureter. the kidney was divided longitudinally the appearances shown in the accompanying drawing were visible. The lobulation after the organ has been cut in half is seen to descend right to the middle reservoir of the organ, the cortical layer dipping down and completely shutting off the compartments of medullary substance. The hilus is on the side of the kidney and not on its inner edge. O n the other hand, in the small example of M. latirostrls the kidney, measuring nearly three inches by one and a half in breadth, showed no traces whatever of lobulation, and the hilus was as nearly as possible on the edge of the gland. In Manatus inunguis the shape of the organ, as may be gathered from its measurements, is rather different. It measured three and a half inches in length by two and a quarter in breadth, and showed no traces of lobulation. The hilus was on the side as in the large M. latirostrls. The seeming variability (or is it an unusual change due to age ?) of M. latirostrls is remarkable. The heart of the Manatee is, as is well known, peculiar by 4* |